Bohlender-Graebener BG Radia 520 loudspeaker

Hello, I just bought a pair of these towers, they were from a local former BG dealer nearby. These were used only as display. I have the opportunity to also purchase the a BG 220 center and another pair of 520 towers if I want to go with a 5.1 set up. I currently have a 5.1 set up with smaller B&W CM5’s powered by an Onko TX-NR727 which is actually fine for movies. I’m looking to use these BG Radia’s as a separate system mostly for my vinyl listening pleasure. Any recommendations for the Sub , Processor and Amp ? ( Is separates the way to go? ) While vinyl is my primary source I do want streaming capabilities and a USB port for a digital library.  And should I conder the 220 center as well? Set up is in an above garage room 20x24 with high pitched ceilings. Thank you.